B - Operations – Transporting – 61 – B
Patent
B - Operations, Transporting
61
B
198/12.02
B61B 7/00 (2006.01) B66C 21/00 (2006.01)
Patent
CA 2011110
Abstract A fail-safe log skidding carriage for skyline logging operations utilizes parallel clamp assemblies for engagement of the skyline or dragline in a repeating alternating sequence. The outer ends of a pivoted crank are operably connected to the movable shoes of the two clamp assemblies to move them between operative and released clamping conditions. The crank is moved over-center with respect to a reference line perpendicular to the lines of contact between the crank and the clamp assemblies and intersecting the pivot axis of the crank, thereby preventing accidental mechanical release of a locked crank assembly should hydraulic failure occur during use of the carriage. The hydraulic system is remotely controlled through a radio receiver that sequences the hydraulic cylinder from one extreme position to the other. An overriding electrical control is provided to assure clamping of the dragline when a log or logs are lifted to the carriage.
Christy Mfg. Inc.
Gladhart David
Riches Mckenzie & Herbert Llp
LandOfFree
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